I was on the 03/17 flight. Problem is it was originally booked with KL, but I applied my DL GUC to the itinerary, which allowed DL to take control of the ticket. When the rolling delays were announced, the KL gate agent in SIN refused to help rebook anyone. She said they don’t have the power to rebook; it had to be done once we arrived in AMS (also because it was unclear when we would depart SIN and arrive in AMS due to the rolling delays, so it would be futile to rebook on a flight I may also miss). That didn’t stop DL DM line when I contacted them. I wanted to be rerouted through CDG but they estimated that we wouldn’t make it to AMS in time for the CDG flight so they protected me on a 3pm from AMS-DTW getting me to LAX 10 hours behind schedule (though at least I wouldn’t have had to overnight anywhere). But, they told me KL/airport has control of the ticket since I’m checked in on day of departure so they couldn’t reissue. I told them gate agents weren’t helping so I called KL reservations and they said they don’t have access to DL flights but could put me on KL601 the following day. There were only two seats left in J at that point so I said okay fine. As I understood it, I would board the delayed KL836 flight to AMS on 03/17 and have to overnight in AMS (unless they somehow manage to reissue the ticket with the segments DL put in) and take KL601 on 03/18. Buttttttt… the KL reservations agent either misunderstood (or maybe it was me) and moved both KL836 (SIN-AMS) and KL601 (AMS-LAX) to 03/18. Right as she reissued the tickets, boarding for KL836 started. So, there was no way reservations could put me back on KL836 leaving that evening (03/17). The gate agent initially said there was nothing they could do on their end since the ticket had already been exchanged and boarding had already started, but she said she’d try a few things; and after lots of clicking, she somehow managed to move me back to that evenings very delayed flight to AMS. I was almost sure I was going to be the sole passenger denied boarding on KL836 that night (for being too proactive, I suppose). So by the time I got on the plane I was so exhausted from the stress I passed out. Had I been conscious and of my wits, I would’ve noticed KL605 to SFO was delayed enough to the point where I might have been able to make the connection. Other options would’ve been AUS and YVR (assuming, as I was told, KL could only put me on their own metal; and that once I arrived in North America DL could take it from there). I thought, because DL and KL are close JV partners, moving us between flights during IRROPs would be nbd. Is it much more complicated than that?